Well I'm no fish expert but for the little knowledge I have most if not all the medicine that it is use for treating flukes has praziquantel, witch what it does to the flukes is that it makes the parasite starve and died, as far I as know though it won't kill the eggs, so people always recommend to treat for a period of 21 days, and the regime is 3 days with the medicine in the tank and 4 days without it so that all the eggs that survived die during the treatment period. I have use some pure powder praziquantel from aquascience but I'm still in the treatment as of of right now.